import sys

from PySide6.QtCore import QSize
from PySide6.QtWidgets import QApplication, QMainWindow


def start():
    app = QApplication(sys.argv)

    win = QMainWindow()
    win.setWindowTitle("win")
    win.setFixedSize(QSize(500, 300))
    win.show()

    app.exec()


if __name__ == "__main__":
    start()
